Hey there,me again 
The physic spiders are actually rly cool,had a simular idea when seeing my muk beckon without an animation,but never got to actually make use of it.About the blob thing ,sadly ur molt apporach doesnt rly work,BUT u can switch between status softbody and liquid with high viscosity in realtime,also particle shape emitters can be attached to work with flex,to get a work around.(hope i did express that understandable since english isnt my native language) You can see an example of that when looking closly at my snowman example which turns static mesh to flex liquid particles ,same can be done with a softbody,also just splitting the mesh into different flex components works pretty good:) btw if you want u can help me with something,im trying to recreate the official nvidia flex demo examples and some work arounds in unreal and im rly struggeling with the balloon (softboy surface) filled with liquids ,since A:i found no way to make cloth dismemberment (which is actually used in the demo on the surface of the balloon) working and B: Liquidparticles behave strange in a volume .also whats rly in my intress,did u find any good looking values for surface liquids yet? (dont care so much about fps lose) concering radius,smoothing and so on ,cause i also aked this a couple of times in the gameworks thread but never got an answer to it,however there are some examples which actually look pretty good 
(recreation of the bloody elevator scene for example)